Author: Armin Rigo <ar...@tunes.org>
Branch:
Changeset: r1298:d0ab3b159a1f
Date: 2013-07-29 09:15 +0200
http://bitbucket.org/cffi/cffi/changeset/d0ab3b159a1f/
Log: issue #94: Document
diff --git a/doc/source/index.rst b/doc/source/index.rst
--- a/doc/source/index.rst
+++ b/doc/source/index.rst
@@ -1216,7 +1216,10 @@
``struct foo_s``, return its "address", as a cdata whose type is
``struct foo_s *``. Also works on unions, but not on any other type.
(It would be difficult because only structs and unions are internally
-stored as an indirect pointer to the data.) If ``field`` is given,
+stored as an indirect pointer to the data. If you need a C int whose
+address can be taken, use ``ffi.new("int[1]")`` in the first place;
+similarly, if it's a C pointer, use ``ffi.new("foo_t *[1]")``.)
+If ``field`` is given,
returns the address of that field in the structure. The returned
pointer is only valid as long as the original ``cdata`` object is; be
sure to keep it alive if it was obtained directly from ``ffi.new()``.
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